Sound detection system and alarm system



esta

l "Patented i sientes a -nErEcrroN svsrnrt AND ALARM sYsrnM i t t Enea octet, tsss, ser. No. 847,361

- eciaims. ici. 17asy in vunattended buildings. v Y t *y y lt is `ano'bject of this'invention to provide arsystern `iforprotectingV unattended buildings from bnrglars and intrL-tiersinl the protected buildings. 1

It is a particular object to provide such asystem .telephone system,`

lt is also an'object to system in `wl'iich 'noises `occurring in `the protected-buildings arey pickedup by'conventional telephone vreceivers phone connection with a central protection olice.

i' noises 'occnrringtinithe protectedbuildings are translated into visual signals` upon being received at the central pro- -`tectionoilce so that a single observer can `plurality of protected buildingsl` y v v .wlt is an additional object to provide system in whichV the observerl stationed at thecentral proltection office is provided with earphones permitting him `'protected buildings. e `These and other objects and advantages ofthis inven- 1 tion will morefnlly appear from the following descripi y tion made in connection with the accompanying rawing n wherein like reference characters refer to the sameor similarpars throughout the several views, in which the `figure bodying the present invention., v.

ln the lormvof the invention shown in the accompanytelephonev lines is shown having an exchange or cen- Q trai clice designated by thenumeral 16.

" glary or vandalism are schematically shown by rectangles designated bythe numeral 12. V

.flib and a telephone hook `ldcjis locatedwitbin each of the protected buildings 12 and is connected to `the public y telephone system by atelephone electric circuit line'l 'fin` the form shown, the telephone vsystem includes a plu- .Y provided at the central oi'ce 18,`having a plurality of Vvisual signal devicessuch as the light bulbs 24. Each of y To initiateprotection service, a person in one ofthe.

, L buildings `12 to be protected establishes a telephone ciri `cuit 4connection with the central protection oilice 181` f through thetclephone exchange lll'by dialing a telephone` 'number `assigned to the oce i8 and indicates tbatthe i `This,invention relates to systems for vdetecting noises which i `requires the installation of no apparatusin theA protected l buildingslotherf'thanatelephoneconnected to a public providesuch a'sound detection' l v It is another objectto provide such' a system in which Isuch a protectionk to listen in on `the lines communicating with each of the y ofthe sound detection system has telephone system. ln the formshown, a switchboard is Ambrose Meter-i917 Aldrich S., Minneapolis, 2 Y i i K and departs from unattended. y t t .l Y Noises occurring within the vicinity of the telephone set are translated into electricaliimpulses by the telephone 10 u vandals and `the like by detectingnoises .made by such watch over a 1 isa schematic diagram of a `sound detection system ern t f '4o t. ing drawing,` a public teiephonesystern havinga plurality 2%.V plurality otbuildings to be protected against bur# A telephone set including-'a transmitter 14a, a receiver Y rality of 'conventional telephone sets which .may be refspectively connected by electriccircuit to each of the aow connected to a'public telephone system maintaining tele- Y `occurring remotely lfrom `tected premises.

i building is to be `left unattended. 'The call Vis assigned to Y .f3-y

the switchboard where it is connected to one of the light bulbs 24. The person at theprotectedvbuildingleaves Y the telephone- .oi the telephone hook 14C to Ymaintair.; aA telephoneelectric circuit connection with the otlice 13,- y

the. premises leaving-.the building 12 transmitter 14a and transmitted to the central protection up `intresponsel totransmission thereto of impulses received through the line V32!,corrnmmicating therewith re i sulting from noises occurring within pick-up-range of the `telephone `transmitter 14a connected with the line Ztlf*` through theline 16 and the telephone exchange 10. c .A switchboard attendant is stationed at the switchboard to observe the `light bulbs 24 connected by telephone with t acpi ralityyoi protected buildings;v When a light bulb, n t

24 on the switchboard lights up inresponse to a noise. w picked up in` the` corresponding building 12A bythe teley,

phone transmitter las, a'policemen may be sent to inspectA f the building to determine the cause of the noise.;` A t f The switchboard` attendant is provided with means for f. A `listening in on' the telephone line connected to each ofthe signal bulbs such as theearpbones 28 which may be connected to thecircuit through each bulb 24 by inserting w a plug ,30 intoajack 26 disposed adjacent to each of 'the bulbs 24. Thus ifthe occupant of the building .ret turn'sthereto unexpectedly and makes noises causing the,` t signal light at thel central protection oilice to register his 't Vpresence, he may identify himself to the switchboard observer to Vprevent the sending of-an investigator and Y indicate whether or not be intends yto leave the building` "immediately and if he wishes to maintain sound detection service. t

voltage to producea visual signal uponreceivng the amplitiersignal .from theamplier 32; The ampliers 32 are provided with manually operated adjusting` means to x t permit the switchboard observer to amplify the signals when listening through the earphones 28 and thereby a magnify and identify sounds ofrelativelylow magnitude It is anticipatedrthat amounts ofbacltground noise. In order lto prevent normal outside noises `from signalling the alarm bulb 24 in i the central protection otlce, each of the amplifiers 32 the desired amount` to permitthe bulbs 24 to yrespond to a greater or lesser amount of noise at the correspondt Vthe bulbs24 is connected to one of the telephone lines Ztl.

g. buildings having a telephone connected to a public telephone system, which vobviates the needvforl installing any additional equipment in the buildings to be protected. The ease with which the protection system may be intiated makes thesystem especiallyuseful for obtaining fing protected premises. e y In the eventthat `the telephone connection is broken 60 between the protected premises and the'central protection office by lireor other-damage to the telephone wires 16,

, the visual signal light bulbs 24 are designed to light up in t the same manner as `when noises mitted to tbe central oliice.

lt-will be seen that I haveprovided relatively simple yet highly eiicient and inexpensive protection system fory the transmitter l-la in the prol y the'various protectedpremises will i i V be located 1n different. neighborhoods having vvaryingare picked up and transtates protection of private hoxncswhen the occupants )are to be absent for short or long periods oi time.

" my intention,y which generally stated, consists in the mam 4What is claimed is:

" t at central telephone exchange, each building to be protected having'a telephone set therein including a transinitier, an electric circuitconnecting each of said telef' means for establishing said sound responsive electric circuits through said telephone exchange to said central proj f the velectriccircuits to the telephone sets insaid protected ner` setforth in thel appended claims. i l

1. A1 protection systemior detecting noisesin Vnnat tended'buildingscomprising `a telephone systeni'having VI` Y phone sets'to said central telephone exchange, said circuits being responsive to" sounds reaching said teiephone t V*transmitters, a .centralv protection office having a plurality t a fof telephone lines connected to said telephone e::cl1ange,^`

protection service'onvery short notice 'and further facili-v p buiidingsbeng Aconnected-to one of said 'visual indicating means. t

M It will, 'of course, ,be understood that. various changesVv may 'be made in the form,` details, arrangements and pro-v portionsof'parts without departing. from the scopes/I f2. The rnetnod of detecting and identifying an intruder j: at aiocation having a conventional telephone equipment instailed therein, said'metitod comprising initially` removing the telephone receive-r Vand transmitter from the sup" t rtin base thereof and dialing an assigned number to establish a soimd transmitting electric circuitthr'ough .the .1

` tection oiiice, a telephone switchboard located at said central protection otiice,1a plurality 'of visual indicating, i means atfsaidswitchboard responsiveto actuation totrans- 1 .missionof sounds of predetermined magniiudefeach of central telephone exchange to a central monitoring oice, amplifying at said monitoringoice the signal transmitted from said telephonie transmitter, actnating by an amplified signal o predetermined magnitude an indicator `at said i. monitoring oice to permit an operator to listen to the actual sounds being transmitted from the telephone transmit`- c W "f References Cited in letoi thispatent UNITED STATESKPATENTS 946,259 1 Nexen 1,547,873 #Hopkins 2,083,002"

u17092541 Schmidt w .m May 24, 1955 ran. 11, 1910 l .my 2s, 1925 t- Jui-,1127, 1937 Nov.23,1937 

2. THE METHOD OF DETECTING AND IDENTIFYING AN INTRUDER AT A LOCATION HAVING A CONVENTIONAL TELEPHONE EQUIPMENT INSTALLED THEREIN, SAID METHOD COMPRISING INITIALLY REMOVING THE TELEPHONE RECEIVER AND TRANSMTTER FROM THE SUPPORTING BASE THEREOF AND DIALING AN ASSIGNED NUMBER TO ESTABLISH A SOUND TRANSMITTING ELECTRIC CIRCUIT THROUGH THE CENTRAL TELEPHONE EXCHANGE TO A CENTRAL MONITORING OFFICE, AMPLIFYING AT SAID MONITORING OFFICE THE SIGNAL TRANSMITTED FROM SAID TELEPHONE TRANSMITTER, ACTUATING BY AN AMPLIFIED SIGNAL OF PREDETERMINED MAGNITUDE AN INDICATOR AT SAID 